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(11)制备Fmoc-Pro-Gly-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-树脂: (11) Preparation of Fmoc-Pro-Gly-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-resin: 在步骤(10)的Fmoc-Gly-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-树脂中,加入脱帽试剂10~50℃反应5~30分钟,用真空泵抽干,重新加入脱帽试剂10~50℃反应10~60分钟,抽干,用异丙醇洗涤3次,DMF洗涤3次,重蒸过的DMF洗涤2次,加入用DMF溶解的Fmoc-Pro-OH、DIEA、TBTU/HOBt或HBTU/HOBt或BOP/HOBt的混合物,10~50℃反应10~60分钟,用真空泵抽干,用异丙醇洗涤3次,DMF洗涤3次,重蒸过的DMF洗涤2次,抽干,获得 Fmoc-Pro-Gly-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-树脂; In the Fmoc-Gly-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-resin of step (10), add decapping reagent 10~50 ℃ and react for 5~ 30 minutes, dry with a vacuum pump, re-add the decapping reagent at 10-50 ° C for 10-60 minutes, dry, wash with isopropanol for 3 times, DMF for 3 times, re-distilled DMF for 2 times, add DMF Dissolved Fmoc-Pro-OH, DIEA, TBTU/HOBt or HBTU/HOBt or BOP/HOBt mixture, reacted at 10-50°C for 10-60 minutes, dried with a vacuum pump, washed 3 times with isopropanol and 3 times with DMF times, the DMF that has been steamed again was washed 2 times, and was drained to obtain Fmoc-Pro-Gly-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-resin